Android view invalidate 的相关内容

文章 2024-07-14 来自：开发者社区

Android面试题之View的invalidate方法和postInvalidate方法有什么区别

本文首发于公众号“AntDream”，欢迎微信搜索“AntDream”关注，和我一起每天进步一点点我们在自定义View时免不了要使用invalidate方法，这个方法的作用大家也比较清楚，就是让我们的View进行刷新重新绘制的。但是postInvalidate方法可能就不是那么熟悉了，因为平时开发时invalidate方法...

阿里云文档 2023-09-03

如何自定义Android小程序的View_移动开发平台 mPaaS(mPaaS)

说明：Android 小程序的自定义 View 功能仅在 mPaaS 10.1.68.29 及以上版本中支持。说明升级基线参考 mPaaS 升级指南升级基线版本至 10.1.68.29 及以上，并添加小程序组件至工程。mPaaS 升级指南使用定制的 appx 基础库，代码示例如下： depende...

阿里云文档 2023-09-03

如何自定义View的渲染参数_移动开发平台 mPaaS(mPaaS)

说明：Android 小程序自定义 View 自定义渲染参数功能仅在 mPaaS 10.1.68.29 及以上版本中支持。当前使用的基线版本低于 10.1.68.29 时，可参考 mPaaS 升级指南升级基线版本至 10.1.68.29。说明mPaaS 升级指南小程序标签内添加自定义渲染参数

阿里云文档 2023-09-03

Android小程序如何发送自定义消息_移动开发平台 mPaaS(mPaaS)

说明：Android 小程序发送自定义消息至自定义 View 功能仅在 mPaaS 10.1.68.29 及以上版本中支持。当前使用的基线版本低于 10.1.68.29 时，可参考 mPaaS 升级指南升级基线版本至 10.1.68.29。说明mPaaS 升级指南创建自定义 View contex...

阿里云文档 2023-09-03

如何发送自定义事件至小程序_移动开发平台 mPaaS(mPaaS)

说明：Android 自定义 View 发送自定义事件至小程序功能仅在 mPaaS 10.1.68.29 及以上版本中支持。当前使用的基线版本低于 10.1.68.29 时，可参考 mPaaS 升级指南升级基线版本至 10.1.68.29。说明mPaaS 升级指南在小程序标签内增加自定义事件回调在...

文章 2022-02-16 来自：开发者社区

Android面试，View绘制流程以及invalidate()等相关方法分析

整个View树的绘图流程是在ViewRoot.java类的performTraversals()函数展开的，该函数做的执行过程可简单概况为根据之前设置的状态，判断是否需要重新计算视图大小(measure)、是否重新需要安置视图的位置(layout)、以及是否需要重绘 (draw)，其框架过程如下： measure()过程 &n...

文章 2022-02-16 来自：开发者社区

Android View中的requestLayout和invalidate区别

摘抄自Api Doc RequestLayout：当view确定自身已经不再适合现有的区域时，该view本身调用这个方法要求parent view重新调用他的onMeasure onLayout来对重新设置自己位置。特别的当view的layoutparameter发生改变，并且它的值还没能应用到view上，这时候适合调用这个方法。也就是当通过getLayoutParrms().width = ....

文章 2022-02-16 来自：开发者社区

Android学习自定义View(二)——View和ViewGroup绘制流程以及invalidate()

MainActivity如下: package cc.testviewstudy2; import android.os.Bundle; import android.widget.LinearLayout; import android.app.Activity; /** * Demo描述: * 关于自定义View的学习(二) * * View的绘制流程:onMeasure()-...

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